CN104514767B - Hydro-cylinder - Google Patents
Hydro-cylinder Download PDFInfo
- Publication number
- CN104514767B CN104514767B CN201410782256.2A CN201410782256A CN104514767B CN 104514767 B CN104514767 B CN 104514767B CN 201410782256 A CN201410782256 A CN 201410782256A CN 104514767 B CN104514767 B CN 104514767B
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- China
- Prior art keywords
- cylinder
- hydro
- bar
- ring
- annular groove
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1428—Cylinders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1457—Piston rods
- F15B15/1461—Piston rod sealings
Abstract
The present invention discloses a kind of hydro-cylinder, this hydro-cylinder comprises cylinder cylinder (1), this cylinder cylinder (1) one end is connected with cylinder bottom (2), the other end is formed as cylinder bar external part, wherein, the inner peripheral surface of described cylinder bar external part is provided with the first sealing member (5), described cylinder cylinder (1) and cylinder bottom (2) by be positioned at described cylinder cylinder (1) and simultaneously the positioning element of cylinder cylinder (1) and cylinder bottom (2) described in backstop and be fixed to one another. This hydro-cylinder can meet the requirement of the requirement of strength of hydro-cylinder, matching requirements and physical dimension restriction simultaneously.
Description
Technical field
The present invention relates to Hydraulic Elements field, specifically, it relates to a kind of hydro-cylinder.
Background technology
All can there is many requirements in hydro-cylinder in its assembling, size and intensity. For multistage hydraulic cylinder, the design of current multistage hydraulic cylinder is because of physical dimension restriction, cylinder diameter differs less with two grades of bar footpaths, Fig. 1 shows a kind of multistage hydraulic cylinder of the prior art, its cylinder bottom 2 and cylinder cylinder 1 adopt welded type to connect, sealing by being provided with the orienting sleeve 3 of sealing member between the cylinder bar external part of its secondary cylinder bar 4 and cylinder cylinder 1, the existence of orienting sleeve 3 makes the wall thickness of the cylinder bar external part of cylinder cylinder 1 very thin, which decreases the intensity of hydro-cylinder.
Fig. 2 shows another kind of multistage hydraulic cylinder of the prior art, its cylinder bottom 2 and cylinder cylinder 1 also adopt welded type to connect, between its secondary cylinder bar 4 and the cylinder bar external part of cylinder cylinder 1, the same orienting sleeve 3 by being provided with sealing member seals, in order to ensure the intensity of hydro-cylinder, the external diameter increase of the end stretched out for cylinder bar of cylinder cylinder 1, thus the physical dimension restriction of multistage hydraulic cylinder cannot be met.
The inner peripheral surface of the cylinder bar external part of the cylinder cylinder 1 in another multistage hydraulic cylinder of the prior art in Fig. 3 is provided with sealing member, so not needing to seal secondary cylinder bar 4 by the orienting sleeve 3 in Fig. 1 and Fig. 2, so the size of the cylinder bar external part of cylinder cylinder 1 can meet size limitation requirement, but in this case, owing to being subject to the constraint of the size of cylinder cylinder 1 own, (namely the internal diameter of the cylinder bar external part of cylinder cylinder 1 is relatively little, it is less than the internal diameter of one end being connected with cylinder bottom 2 of cylinder cylinder 1), secondary cylinder bar 4 is generally not capable of the cylinder bar external part by cylinder cylinder 1 to carry out dismounting (insert or extract), so at this moment cylinder bottom 2 and cylinder cylinder 1 by this kind of flange arrangement removably mode carry out connecting so that secondary cylinder bar 4 can realize dismounting (insert or extract) by one end being connected with cylinder bottom 2 of cylinder cylinder 1, flange arrangement makes the oversize of one end being connected with cylinder bottom 2 of cylinder cylinder 1, the physical dimension restriction of multistage hydraulic cylinder can not be met.
, it is necessary to provide a kind of novel hydro-cylinder, Given this to meet the requirement of the requirement of strength of hydro-cylinder, matching requirements and physical dimension restriction simultaneously.
Summary of the invention
It is an object of the invention to provide a kind of hydro-cylinder, this hydro-cylinder can meet the requirement of the requirement of strength of hydro-cylinder, matching requirements and physical dimension restriction simultaneously.
In order to realize above-mentioned purpose, the present invention provides a kind of hydro-cylinder, this hydro-cylinder comprises cylinder cylinder, this cylinder cylinder one end is connected with cylinder bottom, the other end is formed as cylinder bar external part, wherein, the inner peripheral surface of described cylinder bar external part is provided with the first sealing member, described cylinder cylinder and cylinder bottom by be positioned at described cylinder cylinder and simultaneously the positioning element of cylinder cylinder and cylinder bottom described in backstop and be fixed to one another.
Preferably, described positioning element is back-up ring, and described back-up ring is arranged in the periphery annular groove of described cylinder bottom and the inner circumferential annular groove of described cylinder cylinder.
Preferably, the contact surface of described cylinder cylinder and cylinder bottom is formed with radial groove relative to each other respectively, the respective radial groove of described cylinder cylinder and cylinder bottom forms radial hole jointly, is provided with, in described radial hole, the fastening piece preventing described cylinder cylinder and cylinder bottom from relatively rotating with respect to each other.
Preferably, described radial groove to be cross section be semicircle screw thread groove, described fastening piece is threaded fastener.
Preferably, described cylinder bottom is formed with axial opening, described axial opening is connected with the bottom of the periphery annular groove of described cylinder bottom, being provided with secure component in described axial opening, described secure component contacts with the inner peripheral surface of described back-up ring so that described back-up ring is fastened in the periphery annular groove of described cylinder bottom and the inner circumferential annular groove of described cylinder cylinder.
Preferably, described cylinder cylinder is formed with at least two passages being connected the outside of described cylinder cylinder and the bottom of described periphery annular groove, with can by being pressed in the periphery annular groove entering cylinder bottom completely by described back-up ring by casting die at least two passages described in stretching into respectively.
Preferably, described at least two passages are two, and the same bar that described two passages bearing of trend separately is in described cylinder cylinder is diametrically.
Preferably, described hydro-cylinder is multistage hydraulic cylinder, and described first sealing member is posted by the final stage cylinder bar in described cylinder bar.
Preferably, the periphery of described final stage cylinder bar is provided with the first annular recesses, is provided with the 2nd sealing member of the inner-wall surface being posted by described cylinder cylinder in described first annular recesses.
Preferably, the inner peripheral surface of described final stage cylinder bar is provided with second ring groove, described second ring groove is provided with Sealing shield ring, the periphery of described final stage cylinder bar is formed with the step corresponding with described Sealing shield ring, so that when described final stage cylinder bar retraction puts in place, described step and the mutual backstop of described Sealing shield ring.
Pass through technique scheme, owing to the inner peripheral surface of the cylinder bar external part in hydro-cylinder provided by the invention being provided with the first sealing member, so no longer needing the sealing cylinder bar external part of the orienting sleeve by being provided with sealing member, save guide sleeve structure and can ensure that the wall thickness of cylinder bar external part not only meets requirement of strength but also meet the requirement (needs do not increase cylinder bar external part external diameter) of physical dimension restriction, in addition, described cylinder cylinder and cylinder bottom by be positioned at described cylinder cylinder and simultaneously the positioning element of cylinder cylinder and cylinder bottom described in backstop and be fixed to one another, owing to this positioning element is positioned at described cylinder cylinder, so ensure that this positioning element can not affect the physical dimension of one end being connected with cylinder bottom of cylinder cylinder, it is thus possible to meet the requirement of the physical dimension restriction of one end being connected with cylinder bottom of cylinder cylinder, and the connection of cylinder cylinder with cylinder bottom can be ensured by dismounting positioning element or be separated, thus namely now cylinder bar can from one end being connected with cylinder bottom 2 realization dismounting (insert or extract) of cylinder cylinder 1 to ensure that matching requirements, can sum up from above analysis, hydro-cylinder provided by the invention can meet the requirement of strength of hydro-cylinder simultaneously, the requirement of matching requirements and physical dimension restriction.
Other features and advantages of the present invention are described in detail in embodiment part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification sheets, is used from explanation the present invention with embodiment one below, but is not construed as limiting the invention. In the accompanying drawings:
Fig. 1 is the structural representation of a kind of multistage hydraulic cylinder of the prior art.
Fig. 2 is the structural representation of another kind of multistage hydraulic cylinder of the prior art.
Fig. 3 is the structural representation of another multistage hydraulic cylinder of the prior art.
Fig. 4 is the structural representation of hydro-cylinder according to the embodiment of the present invention.
Fig. 5 is the sectional view along the line A-A cutting in Fig. 4.
Fig. 6 is the enlarged view in the B region in Fig. 4.
Description of reference numerals
1 cylinder cylinder 2 cylinder bottom
3 orienting sleeve 4 secondary cylinder bars
5 first sealing member 6 back-up rings
7 fastening piece 8 secure components
9 path 10s the 2nd sealing member
11 Sealing shield ring 12 steps
13 first-stage cylinder bars
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail. Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
In the present invention, when not doing contrary explanation, it may also be useful to the noun of locality such as " upper and lower, left and right " typically refer to reference to upper and lower, left and right shown in the drawings; It is inside and outside that " inside and outside " refers to relative to the profile of each parts itself.
See Fig. 4, the present invention provides a kind of hydro-cylinder, this hydro-cylinder comprises cylinder cylinder 1, this cylinder cylinder 1 one end is connected with cylinder bottom 2, the other end is formed as cylinder bar external part, wherein, the inner peripheral surface of cylinder bar external part is provided with the first sealing member 5 (such as rubber seal etc., usually abut on the periphery of cylinder bar to seal cylinder bar external part), cylinder cylinder 1 and cylinder bottom 2 by be positioned at cylinder cylinder 1 and simultaneously the positioning element of backstop cylinder cylinder 1 and cylinder bottom 2 and be fixed to one another.
As mentioned above, owing to the inner peripheral surface of the cylinder bar external part of the cylinder cylinder 1 in hydro-cylinder provided by the invention being provided with the first sealing member 5, so no longer needing to seal cylinder bar external part by the orienting sleeve 3 being provided with sealing member of the prior art, save orienting sleeve 3 structure and can ensure that the wall thickness of cylinder bar external part not only meets requirement of strength but also meet the requirement (needs do not increase cylinder bar external part external diameter) of physical dimension restriction, in addition, cylinder cylinder 1 and cylinder bottom 2 by being positioned at cylinder cylinder 1 and stop the positioning element of cylinder cylinder 1 and cylinder bottom 2 simultaneously and are fixed to one another, owing to this positioning element is positioned at cylinder cylinder 1, so ensure that this positioning element can not affect the physical dimension of one end being connected with cylinder bottom of cylinder cylinder 1, it is thus possible to meet the requirement of the physical dimension restriction of one end being connected with cylinder bottom 2 of cylinder cylinder 1, and the connection of cylinder cylinder 1 with cylinder bottom 2 can be ensured by dismounting positioning element or be separated, thus namely now cylinder bar can from one end being connected with cylinder bottom 2 realization dismounting (insert or extract) of cylinder cylinder 1 to ensure that matching requirements, can sum up from above analysis, hydro-cylinder provided by the invention can meet the requirement of strength of hydro-cylinder simultaneously, the requirement of matching requirements and physical dimension restriction.
The specific form of above positioning element is also not particularly limited, such as, can be steady brace or threaded fastener, if can be arranged in cylinder cylinder 1 and simultaneously backstop cylinder cylinder 1 and cylinder bottom 2 and cylinder cylinder 1 and cylinder bottom 2 are fixed to one another. More clearly find out from Fig. 5 or Fig. 6, in a preferred embodiment of the invention, positioning element can be the back-up ring 6 (can be such as Steel Cable Baffle Ring) in the inner circumferential annular groove of the periphery annular groove and cylinder cylinder 1 that are arranged on cylinder bottom 2, this kind of mode that cylinder cylinder 1 and cylinder bottom 2 are fixed to one another by back-up ring 6 not easily twists, and regulates and dismantles also more for convenience.
In addition, the respective radial groove that the contact surface of cylinder cylinder 1 and cylinder bottom 2 can be formed radial groove relative to each other, cylinder cylinder 1 and cylinder bottom 2 respectively forms radial hole jointly, is provided with, in radial hole, the fastening piece 7 preventing cylinder cylinder 1 and cylinder bottom 2 from relatively rotating with respect to each other. Specifically, radial groove can be semicircle screw thread groove for cross section, thus the respective radial groove of cylinder cylinder 1 and cylinder bottom 2 can coordinate formation threaded hole jointly, and fastening piece 7 can be threaded fastener.
In addition, cylinder bottom 2 can be formed axial opening, axial opening is connected with the bottom of the periphery annular groove of cylinder bottom 2, is provided with secure component 8 in axial opening, and secure component 8 contacts with the inner peripheral surface of back-up ring 6 so that back-up ring 6 is fastened in the periphery annular groove of cylinder bottom 2 and the inner circumferential annular groove of cylinder cylinder 1.
In addition, at least two passages 9 being formed with the bottom being connected the outside of cylinder cylinder 1 and periphery annular groove on cylinder cylinder 1, with can by stretch into respectively at least two passages 9 be pressed in the periphery annular groove entering cylinder bottom 2 completely by casting die elongated members such as () such as bar, rod, rods by back-up ring 6 to think cylinder cylinder 1 and cylinder bottom 2 offer prerequisite is provided.
Preferably, at least two passages 9 can be two, and the same bar that the respective bearing of trend of two passages 9 can be in cylinder cylinder 1 diametrically, more convenient like this uses two to stretch into by casting die to press back-up ring 6 in passage 9 respectively.
It is understandable that, the kind of hydro-cylinder provided by the invention is not particularly limited, and such as, this hydro-cylinder can be multistage hydraulic cylinder, for the two-stage hydro-cylinder in Fig. 4, the final stage cylinder bar (the secondary cylinder bar 4 being equivalent in Fig. 4) that the first sealing member 5 is posted by cylinder bar. In addition, the periphery of final stage cylinder bar can also be provided with the first annular recesses, is provided with the 2nd sealing member 10 (such as rubber seal etc., but the present invention is not limited thereto) of the inner-wall surface being posted by cylinder cylinder 1 in the first annular recesses.
In addition, the inner peripheral surface of final stage cylinder bar can be provided with second ring groove, second ring groove is provided with Sealing shield ring 11, the periphery that secondary final stage cylinder bar (is equivalent to the first-stage cylinder bar 13 in Fig. 4) is formed with the step 12 corresponding with Sealing shield ring 11, so that when the retraction of secondary final stage cylinder bar puts in place, step 12 and the mutual backstop of Sealing shield ring 11 are to prevent first-stage cylinder bar 13 skids off from the left end of secondary cylinder bar 4.
4 the assembling process of hydro-cylinder according to the embodiment of the present invention is described in detail with reference to the accompanying drawings below.
During installation, first first-stage cylinder bar 13 is loaded in secondary cylinder bar 4, again secondary cylinder bar 4 is installed in cylinder cylinder 1 from the left end insertion of cylinder cylinder 1, then back-up ring 6 is pressed in the periphery annular groove of cylinder bottom 2 and loads in cylinder cylinder 1 with cylinder bottom 2, can expand when back-up ring 6 arrives the inner circumferential annular groove of cylinder cylinder 1 and be stuck in simultaneously in the periphery annular groove of cylinder bottom 2 and the inner circumferential annular groove of cylinder cylinder 1 thus cylinder cylinder 1 and cylinder bottom 2 are fixed each other axially, at this moment in the axial opening of cylinder bottom 2, secure component 8 can be installed so that back-up ring 6 is fastened in the periphery annular groove of cylinder bottom 2 and the inner circumferential annular groove of cylinder cylinder 1, can jointly be formed in radial hole at the respective radial groove of cylinder cylinder 1 and cylinder bottom 2 subsequently and fastening piece 7 is installed thus cylinder cylinder 1 and cylinder bottom 2 are radially fixed each other, so far, cylinder cylinder 1 and cylinder bottom 2 are completely fixed each other, thus complete the installation of this hydro-cylinder.
During dismounting, first fastening piece 7 and secure component 8 can be removed, then enter cylinder cylinder 1 from the outside of cylinder cylinder 1 along two passages 9 (two passages 9 up and down Fig. 4) by casting die elongated members such as () such as bar, rod, rods by two inner and be pressed in the periphery annular groove of cylinder bottom 2 by back-up ring 6, finally further cylinder bottom 2 is extracted from cylinder cylinder 1 dismounting that can realize this hydro-cylinder.
Below the preferred embodiment of the present invention is described by reference to the accompanying drawings in detail; but; the detail that the present invention is not limited in above-mentioned enforcement mode; within the scope of the technical conceive of the present invention; the technical scheme of the present invention can being carried out multiple simple variant, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each the concrete technology feature described in above-mentioned embodiment, when not contradiction, it is possible to combined by any suitable mode. In order to avoid unnecessary repetition, various possible array mode is illustrated by the present invention no longer separately.
In addition, can also carrying out arbitrary combination between the various different enforcement mode of the present invention, as long as it does not run counter to the thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (8)
1. a hydro-cylinder, this hydro-cylinder comprises cylinder cylinder (1), this cylinder cylinder (1) one end is connected with cylinder bottom (2), the other end is formed as cylinder bar external part, it is characterized in that, the inner peripheral surface of described cylinder bar external part is provided with the first sealing member (5), described cylinder cylinder (1) and cylinder bottom (2) by be positioned at described cylinder cylinder (1) and simultaneously the positioning element of cylinder cylinder (1) and cylinder bottom (2) described in backstop and be fixed to one another, described positioning element is back-up ring (6), described back-up ring (6) is arranged in the periphery annular groove of described cylinder bottom (2) and the inner circumferential annular groove of described cylinder cylinder (1), described cylinder cylinder (1) is formed at least two passages (9) being connected the outside of described cylinder cylinder (1) and the bottom of described periphery annular groove, with can by described back-up ring (6) be pressed in the periphery annular groove entering cylinder bottom (2) completely by casting die at least two passages (9) described in stretching into respectively.
2. hydro-cylinder according to claim 1, it is characterized in that, the contact surface of described cylinder cylinder (1) and cylinder bottom (2) is formed with radial groove relative to each other respectively, the respective radial groove of described cylinder cylinder (1) and cylinder bottom (2) forms radial hole jointly, is provided with, in described radial hole, the fastening piece (7) preventing described cylinder cylinder (1) and cylinder bottom (2) from relatively rotating with respect to each other.
3. hydro-cylinder according to claim 2, it is characterised in that, described radial groove to be cross section be semicircle screw thread groove, described fastening piece (7) is threaded fastener.
4. hydro-cylinder as claimed in any of claims 1 to 3, it is characterized in that, described cylinder bottom is formed with axial opening on (2), described axial opening is connected with the bottom of the periphery annular groove of described cylinder bottom (2), being provided with secure component (8) in described axial opening, described secure component (8) contacts with the inner peripheral surface of described back-up ring (6) so that described back-up ring (6) is fastened in the periphery annular groove of described cylinder bottom (2) and the inner circumferential annular groove of described cylinder cylinder (1).
5. hydro-cylinder according to claim 1, it is characterised in that, described at least two passages (9) are two, and the same bar that the bearing of trend that described two passages (9) are respective is in described cylinder cylinder (1) is diametrically.
6. hydro-cylinder as claimed in any of claims 1 to 3, it is characterised in that, described hydro-cylinder is multistage hydraulic cylinder, and described first sealing member (5) is posted by the final stage cylinder bar in described cylinder bar.
7. hydro-cylinder according to claim 6, it is characterized in that, the periphery of described final stage cylinder bar is provided with the first annular recesses, is provided with the 2nd sealing member (10) of the inner-wall surface being posted by described cylinder cylinder (1) in described first annular recesses.
8. hydro-cylinder according to claim 6, it is characterized in that, the inner peripheral surface of described final stage cylinder bar is provided with second ring groove, described second ring groove is provided with Sealing shield ring (11), the periphery of secondary final stage cylinder bar is formed with the step (12) corresponding with described Sealing shield ring (11), so that when described final stage cylinder bar retraction puts in place, described step (12) and described Sealing shield ring (11) backstop mutually.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410782256.2A CN104514767B (en) | 2014-12-16 | 2014-12-16 | Hydro-cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410782256.2A CN104514767B (en) | 2014-12-16 | 2014-12-16 | Hydro-cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104514767A CN104514767A (en) | 2015-04-15 |
| CN104514767B true CN104514767B (en) | 2016-06-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410782256.2A Active CN104514767B (en) | 2014-12-16 | 2014-12-16 | Hydro-cylinder |
Country Status (1)
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| CN (1) | CN104514767B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112324737B (en) * | 2020-10-20 | 2021-09-03 | 同济大学 | Adjusting device suitable for building differential settlement |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2155456Y (en) * | 1992-12-09 | 1994-02-09 | 赵育武 | Gasoline tank separated hydraulic cylinder for agricultural machineries |
| CN2937587Y (en) * | 2006-07-28 | 2007-08-22 | 中煤张家口煤矿机械有限责任公司 | Single-acting expansion hydro-cylinder |
| CN201071855Y (en) * | 2007-06-20 | 2008-06-11 | 成都市新津光辉机械实业有限公司 | Multilevel sleeve type hydraulic oil cylinder |
| CN201916274U (en) * | 2011-01-06 | 2011-08-03 | 无锡新贝来液压有限公司 | Pre-cylinder with cylinder bottom connected by clip keys |
| CN102032234A (en) * | 2011-01-06 | 2011-04-27 | 无锡新贝来液压有限公司 | Front cylinder with bottom connected through clip keys |
| CN201925260U (en) * | 2011-01-18 | 2011-08-10 | 德州方向机厂有限责任公司 | Novel expandable sleeve oil cylinder |
| CN102410282A (en) * | 2011-09-21 | 2012-04-11 | 湖南特力液压有限公司 | Connecting structure of functional piece of driving cylinder |
| CN203362693U (en) * | 2013-06-09 | 2013-12-25 | 辽宁阿尔法液压有限公司 | Lifting cylinder guiding and limiting device installation positioning groove |
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2014
- 2014-12-16 CN CN201410782256.2A patent/CN104514767B/en active Active
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| CN104514767A (en) | 2015-04-15 |
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